It pedals smoothly for a bit then creaks, cracks, and snaps irregularly....feels a bit loose when it does this too.
Sounds like a bearing issue in the "bottom bracket" or the housing that holds the cranks, in other words. I would remove the crank and inspect the bearings. There are several different types of bearings. If your bike uses sealed bearings, your only option is usually to just replace them. a "caged" bearing consists of several actual ball bearings, set into a round metal cage that holds them in place. If you have caged bearings, remove them clean them thoroughly, and then re-pack them with bearing grease before reinstalling. also be sure to clean the bearing cups, or any surface that they may come into contact with. Any dirt, sand, or grit makes for a quick death for your bearings. Some bikes just use free floating ball bearings set into the bearing cups. If this is the case, smear a blob of grease into the bearing cups. This will hold the ball bearings in place while you install the rest of them. Be careful when re-inserting the crank not to knock any of the ball bearings down into the bottom bracket. From the sounds of your description, you may be missing a ball bearing or two. Check to make sure there are no large spaces between any two ball bearings. If you could fit another ball bearing into the bearing cup without crowding any of the others out, then you are missing a bearing. Re-assemble everything as it came apart. When tightening the crank into the bottom bracket, be cautious not to over tighten. The crank arm shouldn\'t have any "wiggle" from side to side, and yet should still spin freely on its bearings. I sincerely hope this helps.
SOURCE: Scraping/Squeaking noise on recumbent stationary bicycle
There are most likely some sort of bearings inside the wheel hub that are causing this.
SOURCE: Servicing
Locate where the noise is coming from, chances are the bearings have gone bad go to Kettler fitness.com they have contact info on their web site.
SOURCE: I have a 2008 Specialized
You probably need to completely remove the crank, grease it and reinstall it.
http://www.parktool.com/blog/repair-help
http://www.parktool.com/blog/repair-help/categories/crank-service
Find the correct BB type and follow the instructions. Of course, a crank extractor tool (which Park makes) is required, so if you don't have one you might want to take the bike to a shop and weigh the pros and cons of equipping for self-maintenance or having them do it once in awhile.
SOURCE: My Father has a schwinn Airdyne. the pedal was
There is a metal shim needed in the bike/pedal that has to be tapped in to keep the pedal tight. If you dad has used the bike for several hundred miles and/or his feet might actually bend the pedals over time (weight), it is possible the metal piece that the pedal attaches to could become bent slightly, and I have seen a few bikes, that need to be taken to the bike repair store (call a large bicycle/itness store) that has a good repair shop and they often can repair these, but rarely less than $125 for an Airdyne repair/tuneup.
SOURCE: mongoose xr-75 pedal & crank fell off of bike
I actually found a bike today with an enclosed crank case. Your fix would be simple if it is the same. What you need is to replace the set screw that came out the crank and pedal. When you look at the crank that fell off down where it attaches you should notice a hole without a set screw in it. Find one to fit in that and then put it back on the bike. If you have not figured this out or need more clarification just let me know.
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